package com.maojx.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.common.utils.PageUtils;
import com.common.utils.Query;

import com.maojx.product.dao.CategoryDao;
import com.maojx.product.entity.CategoryEntity;
import com.maojx.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2.组装成父子的树形结构
        
        //2.1找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).map((meau)->{
            meau.setChildren(getChildrens(meau,entities));
            return meau;
        }).sorted((meau1,meau2)->{
            return (meau1.getSort()==null?0:meau1.getSort()) - (meau2.getSort()==null?0:meau2.getSort());
        }).collect(Collectors.toList());

        return level1Menus;
    }

    //递归查找子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            //找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((meau1,meau2)->{
            //菜单排序
            return (meau1.getSort()==null?0:meau1.getSort()) - (meau2.getSort()==null?0:meau2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}